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A major power outage occurred in western North America on August 10, 1996. In this paper we describe simulation of the disturbance using a transient stability program. Initially, the sequence of events was simulated using the standard WSCC dynamic data base, and the simulations did not agree with the disturbance recordings. Several model additions and data modifications were made before the simulations approximated the disturbance recordings. These model changes are discussed in the paper. Table 1 Power flows on major PNWpaths prior to the disturbance. ,,from lngledow (6C Hydro) Keywords: power system modeling, power system stability, power system disturbance, power system performance high voltage direct current .

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